例出2个网孔方程,
红色:6=1000i1+500i3.................(1)
绿色:12=1300i2+500i3..................(2)
i3=i1+i2........................(3)
(2)-(1) 6=1300i2-1000i1
将(3)代入 6=1300i3-1300i1-1000i1
6=1300i3-2300i1
(1)x2.3 13.8=1150i3+2300i1
等立 19.8=2450i3, i3=8mA,i1=1.95mA,i2=6.1mA。